java obj --> jsonString, jsonString --> JSONObject

java obj --> jsonString, jsonString --> JSONObject

• 주의사항 : 객체 getter 가 구현되있어야 함.

        /**
         * java object --> jsonObject string
         * 객체안의 객체도 표현 가능
         * @warnings 주의사항으로는 java object getter 가 구현되있어야 함.
         * @param object
         * @return
         */
        public static String getJsonStringFromJavaObj(Object object) {
            if (ObjectUtils.isEmpty(object)) {
                log.error("object is empty. object : {}", object);
                throw new IllegalArgumentException(String.format("object is empty. object : %s", object));
            }
            try {
                ObjectMapper objectMapper = new ObjectMapper();
                return objectMapper.writeValueAsString(object);
            } catch (Throwable th) {
                log.error(th.getMessage(), th);
                throw new RuntimeException(th);
            }
        }

        /**
         * json string --> JSONObject 변환
         * @param jsonString
         * @return
         */
        public static JSONObject getJSONObjectFromJsonString(String jsonString) {
            if (StringUtils.isEmpty(jsonString)) {
                log.error("jsonString is empty");
                throw new IllegalArgumentException("jsonString is empty.");
            }
            try {
                JSONParser parser = new JSONParser();
                return (JSONObject) parser.parse(jsonString);
            } catch (Throwable th) {
                log.error(th.getMessage(), th);
                throw new RuntimeException(th);
            }
        }



// test

    @Test
    public void getJsonStringFromJavaObjectTest() throws Exception {
        String jsonStr = JsonUtils.getJsonStringFromJavaObj(new Member("test", 10, new Address("test address")));
        Assert.assertNotNull(jsonStr);
    }

    @Test
    public void getJSONObjectFromJsonStringTest() throws Exception {
        String jsonString = JsonUtils.getJsonStringFromJavaObj(new Member("test", 10, new Address("test address")));
        JSONObject jsonObject = JsonUtils.getJSONObjectFromJsonString(jsonString);
        Assert.assertThat(jsonObject.get("name"), is("test"));
        Assert.assertThat(jsonObject.get("age"), is(10L));
    }

    static class Member {
        private String name;
        private int age;
        private Address address;

        public Member(String name, int age, Address address) {
            this.name = name;
            this.age = age;
            this.address = address;
        }

        public String getName() {
            return name;
        }

        public int getAge() {
            return age;
        }

        public Address getAddress() {
            return address;
        }
    }

    static class Address {
        private String addr;

        public Address(String addr) {
            this.addr = addr;
        }

        public String getAddr() {
            return addr;
        }
    }